There was a surge in online learning and education during the COVID-19 pandemic, which means that prior research findings need to be tested against what happened during that time frame in order to see if it still holds up. When largely using computers and online settings to communicate with one another in the teaching realm, how did this impact students' learning and overall performance? For this dissertation, I conducted three experiments to address this concern in the area of feedback. Participants wrote a short essay and then were given different types of feedback through two forms of computer-mediated communication, video and text. Then, they rated feelings of social presence, feelings towards the feedback, and feelings of self-esteem (Experiment 1) or self-efficacy (Experiments 2 and 3). Afterward, they wrote a second short essay. We evaluated participant's essays to see how the feedback and media impacted their performance on the second essay. The first experiment demonstrated video, supportive feedback led to improved writing performance. Supportive feedback also led to positive feelings about the feedback and higher feelings of self-esteem. Video feedback had higher feelings of social presence towards the feedback-giver. The second experiment showed personalized feedback led to improved performance, positive feelings about the feedback, and higher feelings of self-efficacy. Video feedback had higher feelings of social presence and also higher feelings of self-efficacy. Participants also applied the personalized video feedback to their next essay. The third experiment did not show any differences between monotone or exuberant supportive feedback in performance, feelings about the feedback, or self-efficacy but exuberant feedback led to higher feelings of social presence. Overall, these findings show different types of feedback and media improve performance and should be implemented in educational settings. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]